$$ \begin{aligned} 18 &= -6x+4(2x+30)&& \text{simplify right side} \\[1 em]18 &= -6x+8x+120&& \\[1 em]18 &= 2x+120&& \text{ swap the left and right side of the equation } \\[1 em]2x+120 &= 18&& \text{ move 120 to the right } \\[1 em]2x &= 18-120&& \\[1 em]2x &= -102&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= -\frac{102}{2}&& \\[1 em]x &= -51&& \\[1 em] \end{aligned} $$

This page was created using